.part {
    text-align: center;
}

.part h1 {
    margin: 50px 0;
    font-size: 30px;
    color: #fdd100;
    text-shadow: -3px -3px #344ea0;
}

.part table {
    border: 1px solid black;
    border-collapse: collapse;
    margin: 0 auto;
}

.part table th:nth-child(1) {
    width: 100px;
}

.part table th:nth-child(2) {
    width: 100px;
}

.part table th:nth-child(3) {
    width: 120px;
}


/*给所有的th,td加边框*/

.part table th,
td {
    border: 1px solid black;
}